Abstract: An airtight recycling barrel for bulk chemicals includes upper barrel and lower barrel fitted respectively with connecting circles by welding on their peripheries. An O-shaped seal ring is placed at the butt-joint of two barrels. For the lower barrel, an O-ring seal groove is turned out on the connecting circle, an eyelet bolt junction piece is welded to the outer wall of the connecting circle, and the junction piece is fitted with wrist and linchpin. For the upper barrel, a junction piece is also welded to the reinforced plate on the periphery. When these two barrels are butted mouth to mouth for use, they are fixed firmly with eyelet bolt that goes through press plate, and sealed with O-ring. Thus this invention possesses advantages of recycling use, saving of much steel material, convenience of loading and unloading. It is especially suitable for packing and transportation of bulk chemicals.